I was simply pointing out that he didnt speak German like a native, he did speak very good German and knew the idioms of LW fighter pilots, which helped when he interviewed Goering.It didn't matter iff he 'sounded like a Brit speaking German', he had a rare ability for any test pilot in WWII, the ability to read firsthand and and fully comprehend German technical documentation and speak with captured Germands without the need of an interpreter who would not have any aeronautical background and would miss technical nuances.